Sting
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I suggest a tactic that I frequently use and that is ideal for defeating a much larger enemy force.
You need experience in Earth magic. Take a cart, 1 slot for archers (the more, the better), trap them in the upper right corner with a force field, clone the archers, bless them, and then cast Devastating Ray on the monsters. With a sufficient number of casts, the damage becomes maximal!!!
For example, Azure Dragons turn into peasants with 1000 HP:D